Note 2 - Liquidity (Details Textual) - USD ($)		1 Months Ended		9 Months Ended
Note 2 - Liquidity (Details Textual) - USD ($)	Jun. 18, 2019	Dec. 31, 2017	Nov. 30, 2017	Sep. 30, 2019	Sep. 30, 2018
Proceeds from Issuance of Common Stock				$ 6,046,915	$ 3,000,200
Underwritten Public Offering [Member]
Stock Issued During Period, Shares, New Issues	8,000,000
Shares Issued, Price Per Share	$ 0.75
Proceeds from Issuance of Common Stock	$ 5,555,000
Underwritten Public Offering [Member] \| John K. Scott, Jr. [Member]
Stock Issued During Period, Shares, New Issues	4,000,000
Shares Issued, Price Per Share	$ 0.75
Underwritten Public Offering [Member] \| Underwriter [Member]
Stock Issued During Period, Shares, New Issues	4,000,000
Shares Issued, Price Per Share	$ 0.69375
CRG Loan Agreement, Texas Case [Member] \| Judicial Ruling [Member]
Loss Contingency, Damages Awarded, Value, Amount not Taken into Consideration		$ 4,100,000		$ 4,100,000
Platinum-Montaur Life Sciences LLC Litigation [Member]
Loss Contingency, Damages Sought, Value			$ 1,900,000